SU426773A1 - DEVICE FOR THE MANUFACTURING OF DIRECTIONAL PIPES - Google Patents

Description

A device for the manufacture of conduit pipes, comprising non-fixed and movable parts and a forming reference between them, is known.

However, the known device does not allow the use of the method of butt contact welding by pulsed reflow.

The purpose of the invention is to increase labor productivity, improve the quality of welding and reduce the installation power during flash butt welding.

For this, the mandrel of the device is made of two halves, hinged to each other by means of telling the reciprocating movement of the hydrocyliidre relative to each other. Inside these halves are clamping devices in the form of current-carrying shoes connected through a system of levers with α-lidrocyliidry clamped. At its one end, the mandrel is connected to the movable part of the machine, provided with a yoke immediately adjacent to the workpiece to be welded and installed with the possibility of oscillatory movements relative to the center of the pipe being welded together with the workpiece adjacent to it and the upper half of the mandrel.

FIG. 1 shows the described device, a longitudinal section; in fig. 2 is a section along LL in FIG. one; in fig. 3 - cut

on BB on f, u one; in fig. 4 - device element; on f, ig. 5 is a section along bb and FIG. one; in fig. 6 is a view along arrow jT in FIG. one; in fig. 7 - V.ID along arrow D in FIG. one.

The device comprises fixed and movable 2 parts interconnected by reflow cylinders 3 and draft. On the movable part of the machine on the supports 4 rolling mounted holder 5 and hydraulic cylinders 6,

0 interacting with the clip. Between the fixed and movable parts of the machine there is a forming mandrel consisting of the upper 7 and lower 5 halves. In the lower half of the forming mandrel there are cylinders 9, the rods of which with hinges 10 are connected with the upper half of the mandrel. Both halves of the mandrel contain clamping devices consisting of cylinders //, systems of levers 12 and clamping shoes 13 with current supply jaws 14 connected by flexible jumpers 15 to the secondary winding of the welding transformer 16 located on the lower half of the mandrel.

The diameters of the arbor, holder 5

5 and the fixed part / machine are made respectively equal to the inner and outer diameters of the pipe being manufactured 17. The mandrel is connected to the moving part of the machine with its hinges 18, one

0, with some clearance, cover the sleeves 19, which are rigidly connected with the movable part 2 of the machine and are located on the rods 20 mounted in the fixed part / machine. In the slots of the sleeve 19 installed stops. The distance between the rods 20 is greater than the width of the sheet, of which the preform is formed. On the other hand. The lower half of the mandrel has a bracket 22, on which rollers 23 and 24 are mounted, is located w: the wheels under the rollers 25 and 26 attached to the cylinder rods 27 and 28 mounted on (Fixed part of the machine. On the moving part of the machine cylinders 29 are mounted, the rods of which are connected to levers 30 carrying the stops 31. The inner mandrel has a mechanism for fixing the position of its halves consisting of hingedly mounted stoppers 32 connected to the cylinders 33. The spring-loaded rollers 34 and the cylinder are mounted on the fixed part; 35 associated with pivotally attached levers 36. In the upper half of the 7 mandrel, spring loaded rollers 37 connected to a mechanical drive 38 are mounted. The same rollers exist on the lower part of the mandrel. The stationary and movable parts of the machine are equipped with closed chain gears 39, employees for loading the blanks into the machine and delivering the finished pipe. The mechanism for synchronizing the movement of the movable part consists of rails 40 (Fig. 7) rigidly mounted on the fixed part and differential bevel gear 41 mounted on the movable part and communicating with the gears 42 with the rails. On the fixed part there are rollers 43 on both sides, and on the movable part there are also hinges with rollers on both sides 44 connected to cylinders 45.. The melting and sludge cylinders 3 raise the movable part 2 of the machine together with the yoke 5. In this case, the stops 21 and 31 approach respectively the hinges 75 and the protrusion of the bracket 22 and raise the inner mandrel by an amount less than the full stroke of the movable part of the machine. At the same time, cylinders 9 are turned on and the upper 7 and i5 halves of the mandrel are diluted. Then, by turning on the cylinders .3, the stoppers 32 are inserted into the gap between the halfs of the cutoff, thereby fixing the position of the halves of the mandrel relative to each other. Between the mandrel and the stationary part of the maschina, as well as between the mandrel and the holder 5, necessary gaps are formed, into which the rollers 43 and 44 use the chain gears 39 to feed the lower and upper rolled sheets from the rods 20. Then, turn on the cylinders 3 and the mobile and stationary parts The sheets are folded together, thereby folding the sheets around the inner curtain. At the beginning of the process of bending with cylinders 45, the sleeves with rollers 44 are retracted so that they do not interfere with the bending of the top sheet. At the end of the bending, the cylinders 11 are turned on and with the help of the systems of levers 12, the locks are clamped. A current supply is simultaneously provided. Cylinders 33 in} .1 enter the stoppers 32 from the clog between the halves of the mandrel, then turn on the hydraulic cylinders 6, which, transversely to the holder 5, inform the place with the upper workpiece and upper mandrel 7 of the mandrel, oscillatory movements relative to the hinge axis, 10. A welded transformer 16 and a reflow and deposit 3 are included. Two billets, which are in a stress-strain state, are cooked at the same time by two longitudinal seams. During melting and sludge, the oil from the cylinders 9 is displaced into the hydraulic system by force, developed by the cylinders 3, with the result that the halves of the mandrel approach each other. During welding, the synchronization mechanism ensures the uniformity of operation of the cylinders 3. At the end of the welding, turning on the cylinders 29 raise the levers -30, freeing the pipe for the machine to exit. Cylinder 28 is turned on, lifting roller 2d to yinopa into roller 24, at the same time slightly raising the moving part of the device. The roller 26, acting on the roller 24, lifts the end of the inner mandrel, which together with the welded pipe rotates around the hinges 18. Chain gears 39 push the pipe all the way into the closed 26 and 24. The roller 25 is lifted by the cylinder 27, clamping the pipe between it and the roller 23. The roller 26 is retracted, the pipe is removed from the device. , At this time, actuators 38 are turned on, making it easier to take the pipe out. In the proposed device is molded to weld pipes from pre-made semi-cylinders. Levers 36 are provided for loading the upper blank, which are brought to their working position by the cylinders 35, while the cylindrical blank moves along the protrusions of the upper part of the levers. The bottom semi-cylindrical workpiece moves along the rollers 34. The welding process proceeds as described. The subject of the invention is a device for the manufacture of straight pipes, comprising fixed and base parts and a forming mandrel disposed between them, characterized in that, in order to increase labor productivity, improve welding quality and reduce the installation power during flash butt welding by pulsed reflow, the mandrel is made of two half, pivotally interconnected hydraulic cylinders, telling them reciprocating movement relative to each other, are located inside the halves devices in the form of current-carrying shoes connected through a system of levers to clamping hydraulic cylinders, the mandrel being connected at one end to the movable part of the machine, equipped with a clip, directly adjacent to the workpiece being welded and mounted with the possibility of oscillatory movements center of the pipe to be welded together with the workpiece adjacent to it and the upper half of the mandrel.

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